I have a SE Pro on a family members 16' Tri-Glide. It works as advertised and as it's already been said- there isn't a need to move into the Auto Tune arena from SE unless you're doing a lot of traveling that has altitude changes, or you plan to add engine parts down the road. The standard SE tune will do just fine.
Think of it this way- the SEPT is double the cost of the standard tuner- so if you plan to add it now and only do (1) more engine upgrade, you're better off with the standard tuner and just pay a minimal cost to have them load the tune. If you go to the SEPT, you'll not only pay double for the tuner (You're still buying the standard tuner that actually loads the tune AND then the additinoal Auto Tune module that stays on the bike), but you'll also pay additional labor charges if your pipes need to be drilled out for the larger sensors going into the bike.
My closest HD dealer dyno tunes and strongly sways people away from the SE tuners and prefers the Dyno-Jet modules. As also pointed out, due to EPA restrictions, the SE tuners do not have the same flexibility to "dial in" the tune for your bike. If a fuel ratio needs to move +/- 8 points, the Dyno-Jet or other reputable tuners will allow you to do that... however, due to the EPA settlement with the MotorCo, the SE tuners might only allow you to move a maximum of +/- 4 points- so there is the potential that you're not going to really run at the optimum level for your particular set up using SE tuners.
Good luck and let us know what you decide!
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